Stop motion



'J. A. THOMAS.

STOP MOTION.

' APPUCAHON FILED APR= 28,1920- 1,41 1 1 98. Patented Mar. 28, 1922.

M Q N 3 SHEETS--SHEET1- w :4 1\.

1. A. THOMAS.

STOP MOTION.

APPLlCATlON' FILED APR=28,1920.

Patented Mar. 28, 1922.

3 SHEETS-SHEET 2- [rz Vania)" CLc/M UNITED STATES- PATENTgOF FICE.

JAMES A. THOMAS, OF'TROY, NEW YORK, Assm'noa TO CLUETTLPEABODY & oo,,

1110., or TROY, NEwyonK, A CORPORATION or NEW YORK.

STOP Memo r. I

Specificationofzettersratent. Patented Mar. 28, 1922'.

, Application filed April 28, 1920. Serial m3. 377,380.

and useful Improvements in Stop Motions,

of which the following is a specification.

Reference'may be had to the accompanying drawings, and the referencecharacters marked thereon, which forma part of this specification.similar parts in the several figures therein.

This invention relates to improvements in stop-motion mechanism forsewing-machines 'ofvarious kinds. i I V The principal object "of theinvention is to provide a mechanism controlled by the thread undertension, and which when released from the control-ofthe thread-willautomatically quickly stop the operation of the machine.

Other obj'ects will appear in connection with the following description.

Fig. f the drawings is a view in side elevation of a sewing-machineprovided with smy improved stop-motion mechanism.

Fig. 2J-is a top plan view of the same. Fig. 3 is a view in elevation ofthe front end of the machine.

Fig. 4 is a view inelevation of the rear end of'the machine partlybroken away; i

Fig. '5 is a'view in side'elevation of a broken away part-ofthe machineand stopmotion mechanism, including the thread- "con-trolled member,shown on a larger scale than in Fig. 1.' t i M Fig. .6 is a top planviewof a broken-away portion -'ofthe mechanism shown in Fig. -3.

Referring to "the drawings wherein sthe invention is shown in preferredform, :1 is the bed-plate of a sewing-machine having the overhanging'arm, 2, and-head, 3, two presser-feet, 4,.needle, 5,"needle-bar, 6,tension, 7 ,thread-guides, 8 and 9, take-up, 10, check-spring. 11,balance-wheel, 12, mainshaft, '13, fix ed pulley, 14,-loose pulley,- 15,

and driving-belt, '16, "adapted to be shifted from one to,:the other ofthe pulleys, 14

and15, the several parts designatedbeing parts, of a well known typeofqsewingmachine particularly "adapted for hem- In the operation *ofsaid machine, transverse vibrating movements -are impartedto the.needlerbar, 6, by means of a link, .;17,

"21, in a cam Similar characters refer to rocking movement.

connecting said needle-bar with a rockerwhich rocker-arm vibratingmovements are imparted by means of a camafollower, 20, on the rockerarinwhich engages a cam-groove, 22, which' is' rotated in the operation ofthe machine.

As the parts above :described constitute .no feature of my invention adetailed description of the same is deemed unnecessary; and for anunderstanding of the, present invention itwill be sufiicient to merelybear in mind 'that the shaft, 19, ihaisimparted to it in the operationof the machine a rapid The belt, 16, is shifted from time to time fromone to the other of the ipulleys, 14 and 15, by means of a'fork, 23,carriedi byfa rocker-arm, 24', fixed'upon' a rock-ishaft, 25,

rockablymounted upon a bracket,;26,fixed 1 upon the base, 27 o'f thearm,'2.

A brake-arm, 28, is also fixed upon the rock-shaft, 25, just below thebalancewheel, 12,'in position to be automatically moved into engagementwith the balancewheel as the shaft, 25, is rotatively moved in-adirection to causepthe belt to be shifted from the fixed pulley, 14,to'thefloose pulley,

15, whereby as the fixed pulley, .14, and the movable parts of themachine operated thereby are relieved from the driving impulse of-the':belt, 16,?the brake, 25, will automatically be applied to thebalancewheel, ,12,to quickly overcome the momentum of the moving partsof theiinachine.

Rocking rmovements are imparted "to the shaft, '25, bymeans of arocker-arm, 29

fixed upon the shaft and connected by a link, 30; with thexlower end of.a lever, 31,

fulcrumed at '32, upon'the overhanging arm, 2,-of-the machine. i ,1

' The upper portion of the lever, 31, is-connected by a coil-spring, 33,with" the arm, 2, at 34,.which spring acts to move the lever, 31 andtheparts connected therewith in a arm, 18, fixed upon a cross-shaft, 19,-to

so i

as V

direction to shift the belt, 16, fromth'e fixed V pulley, 14, to theloose -pulley, 15,;when said lever,.3 1, is released to the action ofsaid spring.

A rod, 35, pivotally connectedat, 36

the lever, 31, at a point above its fulcrum is mounted to reciprocatelongitudinally througha 'slideway,f37, formed'gon abra-eket,

38, mounted upon the side of'thehead, 3'.

The-front end of the -rod,[3 5,wh1ch pro;-

jects through the slideway, 37, is formed or provided with a shoulder,39, which n the forward position of the rod is adaptedto be engaged by adetent, 40, pivoted at 4'1, and serving when in engagement with saidshoulder, 39, to releasably hold the rod, 35, in its forward positionwith the spring, 33, under tension. The detent, 40, -is disengaged fromthe shoulder, 39, by anupward swinging movement upon its pivotalconnection, 41, to the-position shown in Fig.

and when the shoulder, 39, is thus released from the control of thedetent, a rearward movement is automatically imparted by the spring, 33,to the rod,;35, at the same, time that the spring actuates thebelt-shifting mechanism to shift the belt from the fixed pulley, 14, tothe loose pulle '15; 4

: fhe detent, 40, has a-flange, 42, adapted to be engaged at certaintimes by a cam, 43, fixed upon a longitudinally reciprocatoryrock-shaft,"44, mounted in bearings on the bracket, 38, whereby aforward longitudinal movement of the shaft, 44, when the cam, 43, isinline with'the flange, 42, will cause the detent to be swung upward asshown in 'Fi 5-. r

' offset, 45, fixed upon the shaft, 44, by means of the same hub orsleeve, 46, as that from whichthe cam, 43, projects, is adapted to bemoved. by'ro'cking movement of'the shaft, 44, into and out of the pathof a rod,

imparted to-the rod, 47L

47, reciprocatory through a slideway, 48, formed on the bracket, 38. andpivotally connected at its rear end at 49, with a rocker-arm, 50, fixedupon the rock-shaft, '19, which it willbe remembered is rapidlyoscillated or rocked in the operation of the machine, v a

f In the operation of the machine rapid longitudinal. reciprocatingmovements are thus Fixed upon the frontend of the rockshaft,-"44, is'anarm, 51, provided with an eye, 52,; adapted to receive the stretch ofthread,"53,"between the tension, 7, and-the thread-guide,'9.

This-arm, 5.1, is so fixed upon the shaft,

44,:that when the eye,-52, is engaged by the thread under tension theoffset, 45, {"onithe shaft, 44," will be atone side ofthe path of therapidly reciprocating rod, 47.

. counter-balance, 54, tends to rotate the shaft, 44, in a direction tomove the offset,

. 45, into the path of "the rapidly reciprocatingrod, 47, butthe'counter-balance is in- 'efiective to thus rotate the shaft, 44,- solong as the arm, 51, is under the control'of the thread undertension,f,1'

" :The operation" of the stop-motion-mechanlsmis -as'follows U I T'Themachinebeing in operation, driven by thebelt, 16, in engagement with'thefixed -pu1ley, -14,. and the parts in the position shown in Fig. 1 withthe arm, 51, under the control of the thread under tension, and the;

niatically rotated by the counter-balance, 54, bringing the offset, 45,into the path of the rapidly reciprocating rod, 47, which immediatelyimpinges against said offset thereby forcing the shaft, 44, with saidoffset and the cam, 43,-forwardly,thus forcing the cam, 43,'to engagethe flange, 42,011 the detent, 40, and raise the detent to the positionshown in Fig. 5, thus disengaging the detent from the shoulder, 39, onthe rod, 35.

The spring, 33, being thus released from the control of the rod, 35,-causes the lever, 31, to be moved in a direction to actuate, thebelt-shifting-mechanism in a direction to shift the belt from the fixed'pulley-, 1l4, -:to the loose pulley, 15, thusfdiscontinuin'g theapplication of driving power tovthe'ma overcome the momentum 'offithe;"moving Parts of the mach1ne.-

. After the arm, 51,'has again been placed under the control of the,thread, 53,; the machine canbe started and the stop-motion mechanismreset by moving. the lever,:31, in

opposition to the force of the s'pfring,:33 by means of any arm, 55,fixed upon said lever the detent, 40,- automatically making rockingengagement with the shoulder, 39, as the rod, 35, is thus moved forward.

The coil-spring, .56, tends to z'impartto the shaft, 44, a movement in adirection op posite to that imparted to the shaft by'means of the rod,47. r 1

I have shown and described my invention in its applicationto a'well'known typeof sewing-machine, butyit is also applicable to various other.machines employing thread under tension. 7 What I claim asnewjand byLetters Patent isdesire to secure 1. In a sewing-machine and in:combination, a member vibratory inthe-operation of the machine; a rodconnectedwith said member to be longitudinally reciprocated thereby; alongitudinally slidable'1rockshaft; an offset on saidrock-shaft mo-vableby rocking movement of the shaft into andout of the path of said rod; a\cam' carried by said rock-shaft; a thread-engaging member whereby saidrock-shaft is supported 'in'the normal operation of:the machine withsaid offsetremoved fromthe path of said rod,

means being provided whereby said rockshaft when released from thecontrol of'the thread automatically assumes a position with said offsetin the path of said rod; beltshifting-mechanism' automatically actuatedto stopthe machine andhaving air d formed with a shoulder; adetentremevably engageable with said shoulder forpreventing auto maticoperation of the belt-shifting-mechanism, said detent having a memberlocated in the path of said cam when said offset is located in the pathofsaid rod.

2 In a sewing-machine and in combination, a shaft rapidly rocked in theoperation of the machine a rocker-arm on said shaft; a rod connectedwith said rocker-arm whereby longitudinal reciprocating movements areimparted to the rod; a longitudinally slidably rock-shaft; an offset onsaid rockshaft movable by rocking movement of the shaft into and out ofthe path of said rod;

a .cam carried by said rock shaft; a thread- 5 engaging member wherebysald rock-shaft is supported in the normal operation of the;

machine with said offset removed from the path of said rod, means beingprovided whereby said rock-shaft when released from the control of thethread automatically assumes a position with said offset in the path ofsaid rod, belt-shifting-mechanism autoshoulder for preventing automaticoperation J of the be1t;shifting-mechanism, said detent having a memberlocated in the path of said cam when said offset is locatedin the pathof said rod.

In testimony whereof, I have hereunto

